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4091-02-5

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4091-02-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4091-02-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,0,9 and 1 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 4091-02:
(6*4)+(5*0)+(4*9)+(3*1)+(2*0)+(1*2)=65
65 % 10 = 5
So 4091-02-5 is a valid CAS Registry Number.

4091-02-5Relevant articles and documents

The Photocycloaddition of N-Vinylcarbazole with 3-Cyanostyrene

Tsuchida, Akira,Yamamoto, Masahide,Nishijima, Yasunori

, p. 2899 - 2904 (1987)

The photocycloaddition reaction of N-vinylcarbazole (VCZ) as an electron donor, with 3-cyanostyrene as an electron acceptor, was studied.In nonpolar solvents, two cyclobutanes of cis-1-(9-carbazolyl)-2-(3-cyanophenyl)cyclobutane and trans-1-(9-carbazolyl)-2-(3-cyanophenyl)cyclobutane (in a ratio of 3:1) were obtained from an exciplex intermediate.The structure of cis cyclobutane seemed to originate from a sandwich conformation of the exciplex.In polar solvents, a photodissociation to free ion radicals was observed and trans-1,2-di(9-carbazolyl)cyclobutane was produced efficiently by means of a chain mechanism via a cation radical of VCZ.Transient intermediates were measured by means of nanosecond laser photolysis; the results supported the reaction scheme.

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